Everything you could ever want to know about the H series
http://www.b20vtec.com/forums/h-f-se...ies-specs.html

To answer your question a little, if you get the same OBD as your car, yes just about everything will plug in. Easiest way to tell if an engine is OBD1 or 2 is the dizzy plug. The H22A1 is OBD1, A4's are from the last body style prelude. I'd suggest doing an H2B over a straight H22 swap anyday though, not a fan of those cable shifted trannies.